Transport network layer associations on the FI interface

ABSTRACT

Apparatuses, systems, methods, and computer-readable media associated with F1 interface arrangement configuration within a network that implements virtualized NodeBs are disclosed herein. In embodiments, one or more non-transitory computer-readable media having instructions stored thereon, wherein the instructions, in response to execution by one or more processors, cause a centralized unit (CU) of an access node to generate a CU configuration update message, the CU configuration update message to include an indication of a transport network layer (TNL) address of the CU for which a TNL association between the CU and a distributed unit (DU) of the access node is to be added or removed, and cause the CU configuration update message to be transmitted to the DU. Other embodiments may be described and/or claimed.

RELATED APPLICATIONS

The present application claims priority to U.S. Provisional PatentApplication No. 62/582,839, filed Nov. 7, 2017, entitled “MULTIPLESTREAM CONTROL TRANSMISSION PROTOCOL (SCTP) ASSOCIATIONS ON THE F1INTERFACE,” the entire disclosure of which is hereby incorporated byreference.

TECHNICAL FIELD

The present disclosure relates to the field of wireless networks. Moreparticularly, the present disclosure relates to F1 interface arrangementconfiguration within a network that implements virtualized NodeBs.

BACKGROUND

The background description provided herein is for the purpose ofgenerally presenting the context of the disclosure. Unless otherwiseindicated herein, the materials described in this section are not priorart to the claims in this application and are not admitted to be priorart by inclusion in this section.

With the development of fifth generation (5G) wireless communications,virtualized NodeBs have been developed. In particular, each virtualizedNodeBs includes a distributed unit (DU) that manages a first portion ofthe layers of the wireless communications and a centralized unit (CU)that manages a second portion of the layers of the wirelesscommunications. While this separation of the virtualized NodeBs into DUsand CUs has provided advantages, additional communication needs to bemanaged to facilitate the arrangement.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will be readily understood by the following detaileddescription in conjunction with the accompanying drawings. To facilitatethis description, like reference numerals designate like structuralelements. Embodiments are illustrated by way of example, and not by wayof limitation, in the figures of the accompanying drawings.

FIG. 1 illustrates an example F1 setup procedure, according to variousembodiments.

FIG. 2 illustrates example information elements (IEs) that may beincluded in a response message, according to various embodiments.

FIG. 3 illustrates an example CU configuration update procedure,according to various embodiments.

FIG. 4 illustrates example IEs that may be included in a message,according to various embodiments.

FIG. 5 illustrates an example portion of a network implementation thatincludes virtualized NodeBs, according to various embodiments.

FIG. 6 illustrates an architecture of a system of a network inaccordance with some embodiments.

FIG. 7 illustrates an architecture of a system of a network inaccordance with some embodiments.

FIG. 8 illustrates example components of a device in accordance withsome embodiments.

FIG. 9 illustrates example interfaces of baseband circuitry inaccordance with some embodiments.

FIG. 10 is an illustration of a control plane protocol stack inaccordance with some embodiments.

FIG. 11 is an illustration of a user plane protocol stack in accordancewith some embodiments.

FIG. 12 illustrates components of a core network in accordance with someembodiments.

FIG. 13 is a block diagram illustrating components, according to someexample embodiments, of a system to support NFV.

FIG. 14 is a block diagram illustrating components, according to someexample embodiments, able to read instructions from a machine-readableor computer-readable medium (e.g., a non-transitory machine-readablestorage medium) and perform any one or more of the methodologiesdiscussed herein.

DETAILED DESCRIPTION

Apparatuses, systems, methods, and computer-readable media associatedwith F1 interface arrangement configuration within a network thatimplements virtualized NodeBs are disclosed herein. In embodiments, oneor more non-transitory computer-readable media having instructionsstored thereon, wherein the instructions, in response to execution byone or more processors, cause a centralized unit (CU) of an access nodeto generate a CU configuration update message, the CU configurationupdate message to include an indication of a transport network layer(TNL) address of the CU for which a TNL association between the CU and adistributed unit (DU) of the access node is to be added or removed, andcause the CU configuration update message to be transmitted to the DU.

In the following detailed description, reference is made to theaccompanying drawings which form a part hereof wherein like numeralsdesignate like parts throughout, and in which is shown by way ofillustration embodiments that may be practiced. It is to be understoodthat other embodiments may be utilized and structural or logical changesmay be made without departing from the scope of the present disclosure.Therefore, the following detailed description is not to be taken in alimiting sense, and the scope of embodiments is defined by the appendedclaims and their equivalents.

Aspects of the disclosure are disclosed in the accompanying description.Alternate embodiments of the present disclosure and their equivalentsmay be devised without parting from the spirit or scope of the presentdisclosure. It should be noted that like elements disclosed below areindicated by like reference numbers in the drawings.

Various operations may be described as multiple discrete actions oroperations in turn, in a manner that is most helpful in understandingthe claimed subject matter. However, the order of description should notbe construed as to imply that these operations are necessarily orderdependent. In particular, these operations may not be performed in theorder of presentation. Operations described may be performed in adifferent order than the described embodiment. Various additionaloperations may be performed and/or described operations may be omittedin additional embodiments.

For the purposes of the present disclosure, the phrase “A and/or B”means (A), (B), or (A and B). For the purposes of the presentdisclosure, the phrase “A, B, and/or C” means (A), (B), (C), (A and B),(A and C), (B and C), or (A, B and C).

The description may use the phrases “in an embodiment,” or “inembodiments,” which may each refer to one or more of the same ordifferent embodiments. Furthermore, the terms “comprising,” “including,”“having,” and the like, as used with respect to embodiments of thepresent disclosure, are synonymous.

As used herein, the term “circuitry” may refer to, be part of, orinclude an Application Specific Integrated Circuit (ASIC), an electroniccircuit, a processor (shared, dedicated, or group) and/or memory(shared, dedicated, or group) that execute one or more software orfirmware programs, a combinational logic circuit, and/or other suitablecomponents that provide the described functionality.

In new radio (NR) implementations, an N2 interface may be between anAccess and Mobility Management Function (AMF) and Radio Access Network(RAN), and may provide Non-Access Stratum (NAS) transportservices/functionality (see, e.g., FIG. 7 infra). The N2 interface maymap to an NG control plane (NG-C) interface, which may be a logicalinterface between an AMF and RAN node. The NG-C protocol stack mayinclude a transport network layer that is built on Internet Protocol(IP) transport. For the reliable transport of signaling messages, astream control transmission protocol (SCTP) layer is added on top of theIP layer. The application layer signaling protocol on top of the SCTPlayer is referred to as NG Application Protocol (NG-AP).

Some NR systems may support multiple SCTP associations on the NG-C/N2interface. This enables Fifth Generation (5G) Core Network deploymentsin virtualized environments by facilitating smooth relocation of AMFfunction to another virtualized resource.

The same approach can be applied to RAN, where a split architecture iscurrently being developed in which a next generation NodeB (gNB) andnext generation evolved NodeB (ng-eNB) (which are also referred to as“access nodes” throughout this disclosure) are split into CentralizedUnit (CU) and Distributed Unit (DU) (also referred to as gNB-CU/gNB-DUand ng-eNB-CU/ng-eNB-DU). The gNB may support 5G NR bands, such as 3.5GHz band or 28 GHz band, while the ng-eNB may support LTE bands and alsoincludes some 5G capabilities.

If CU is deployed in the virtualized environment, multiple SCTPassociations support on the F1 interface can also be beneficial for thesame reasons as for the NG-C/N2 interface—that is, in certaindeployments instantiating new computational resources in CU may requireadding new Transport Network Layer (TNL) addresses, and consequentlybringing down certain computational resources may require releasingcertain TNL addresses.

A single SCTP association may be employed for F1 application protocol(F1AP) elementary procedures that utilize F1AP signaling not related toa user equipment (UE), e.g., F1 Setup and Configuration Update, with thepossibility of fail-over to a new association to enable robustness.Running other F1AP procedures over this same SCTP association is notprecluded.

Various embodiments herein define standardized mechanisms to supportmultiple SCTP associations on the F1 interface. In embodiments, theNG-C/N2 principles may be followed, including: the assumption that oneTNL address of the CU is pre-configured in the DU via operations,administration, and maintenance (OAM); that the DU establishes the firstSCTP association using the pre-configured TNL address; and that the CUmay indicate additional TNL addresses using either Setup orConfiguration Update procedures.

The embodiments herein may be related to the stage-3 definition of F1interface functionality and associated F1AP messages to support multipleSCTP associations between a DU and CU. The terms DU and CU, as used inthe present disclosure, may refer to either gNB-DU and gNB-CU orng-eNB-DU and ng-eNB-CU in NG-RAN (referring to “pure” 5G gNB and“evolved” eNB, respectively). In either case, the same F1 interface maybe used.

F1 Interface

In various implementations, the F1 interface is a 5G radio network layersignaling protocol for signaling service between a DU of an access nodeand the a CU of the access node. The F1 Application Protocol (F1AP)supports the functions and signaling services of the F1 interface. F1APservices are divided into two groups: non-UE-associated services andUE-associated services. Non-UE-associated services are services relatedto the whole F1 interface instance between the DU of the access node andCU of the access node utilizing a non UE-associated signalingconnection. UE-associated services are services related to one UE. F1APfunctions that provide these services are associated with aUE-associated signaling connection that is maintained for the UE inquestion.

F1 Setup

FIG. 1 illustrates an example F1 setup procedure 100, according tovarious embodiments. The F1 setup procedure 100 may facilitate the setupof TNL associations on the F1 interface. In particular, the F1 setupprocedure 100 can be implemented to set up configuration parametersbetween a distributed unit (DU) 102 of an access node and a centralizedunit (CU) 104 of the access node. The F1 setup procedure 100 canexchange application level data for the DU 102 and the CU 104 tocorrectly interoperate on the F1 interface. The F1 Setup procedure maybe the first F1AP procedure triggered after a TNL association has becomeoperational. The F1 setup procedure may use non-UE associated signaling.

The F1 setup procedure 100 initiates with the DU 102 transmitting amessage 106 to the CU 104. In particular, the message 106 may be an F1setup request message. The message 106 may be transmitted in response toa transport network layer (TNL) association becoming operational.

In response to receiving the message 106, the CU 104 transmits aresponse message 108. In particular, the response message 108 may be anF1 setup response message. The response message 108 may be transmittedto transfer information for a TNL association. The response message 108may include information regarding additional TNL addresses for which TNLassociations may be established. The TNL associations may comprise SCTPassociations in some embodiments.

FIG. 2 illustrates example information elements (IEs) that may beincluded in a response message, according to various embodiments. Inparticular, one or more of the IEs may be included in a responsemessage, such as the response message 108 (FIG. 1).

The response message may include IEs used to identify the responsemessage and the origin of the response message. In particular, theresponse message may include a message type element 202 that indicatesthe type of the message. Further, the response message may include a gNBidentifier 204 that indicates a source of the message. The gNBidentifier 204 may indicate a virtualized access node that includes a CUand a DU. In other instances, the response message includes a gNBidentifier 204 that may indicate a non-virtualized gNB, anon-virtualized ng-eNB, a virtualized gNB, or a virtualized ng-eNB. Thevirtualized ng-eNB includes an ng-eNB-CU and an ng-eNB-DU.

The response message may further include IEs related to cells to beactivated. In particular, the response message may include one or moreof a cells to be activated list IE 206, a cells to be activated listitem IE 208, an NR cell identifier IE 210, a gNB-CU system informationIE 212, a broadcast public land mobile network (PLMN) IE 214, a trackingarea identifier (TAI) IE 216, or some combination thereof. The cells tobe activated list IE 206 indicates whether there are cells to beactivated. The cells to be activated list item IE 208 indicates a listof cells that are to be activated. The NR cell identifier IE 210indicates identifiers for the NR cells to be activated. The gNB-CUsystem information IE 212 may include a radio resource control (RRC)container with system information owned by the CU of a virtualizedaccess node. The broadcast PLMN IE 214 indicates available PLMNs. TheTAI IE 216 indicates supported single-network slice selection assistanceinformation.

The response message may further include IEs related to TNL associationsto be setup. In particular, the response message may include a CU TNL tobe setup list IE 218, CU TNL to be setup item IEs 220, a CU transportlayer address IE 222, or some combination thereof. The CU TNL to besetup list IE 218 indicates that one or more TNL associations betweenthe CU and the DU should be established by the DU. In particular, the CUTNL to be setup list IE 218 may contain a first value that indicatesthat there are one or more TNL associations to the be established or asecond value that indicates that there are no TNL associations to beestablished.

The CU TNL to be setup item IEs 220 indicates one or more TNLassociations between the CU and the DU that should be established by theDU. For example, the CU TNL to be setup items IEs 220 may include a listof TNL associations to be established.

The CU transport layer address IE 222 indicates one or more TNLaddresses of the CU. The DU may utilize the TNL addresses forestablishing one or more TNL associations between the CU and the DU. Forexample, the DU may establish, or attempt to establish, the TNLassociations indicated by the CU TNL to be setup item IEs 220 via theone or more TNL addresses indicated by the CU transport layer address IE222. In some embodiments, the TNL associations may be SCTP associations.

The DU may establish one or more TNL associations between the CU and theDU in response to receiving the CU TNL to be setup list IE 218, the CUTNL to be setup item IEs 220, and the CU transport layer address IE 222in the response message. The TNL associations may be SCTP associations.

Once multiple SCTP associations have been established between the CU andthe DU, load balancing may be implemented. The load balancing may beutilized mainly for UE-associated signaling, where only one connectionmay be used for non-UE-associated signaling.

In some embodiments, the load balancing may be implemented by the DUrandomly selecting an SCTP association for every UE in communicationwith the DU. Once the SCTP association is selected for every UE, boththe DU and the CU continue using the selected SCTP association for theUE.

In some embodiments, the load balancing may be implemented by the CUrandomly selecting an SCTP association for every UE. Once the SCTPassociation is selected for every UE, both the DU and the CU continueusing the selected SCTP association for the UE.

In some embodiments, the load balancing may be implemented by one SCTPassociation being designated for load balancing. The DU sends a firstuplink (UL) message via the one SCTP association. The CU may reply viaanother SCTP association, where the other SCTP association is then usedfor that UE by both the DU and the CU.

In some embodiments, the load balancing may be implemented by applyingweight factors in the SCTP association selection procedure. The CU maysignal the weight factors to be utilized in the SCTP associationselection procedure. The SCTP association with higher weights may have ahigher weight for being selected for association with the UE.

F1 Configuration Update

FIG. 3 illustrates an example CU configuration update procedure 300,according to various embodiments. In some embodiments, the CUconfiguration update procedure 300 may comprise a gNB-CU configurationupdate procedure. The CU configuration update procedure 300 mayfacilitate the update of TNL associations on the F1 interface. When a CUis deployed in a virtualized environment, the CU may have the capabilityof having computational resources being added or removed in a dynamicfashion. In particular, the computational resources may include computerhardware (such as network resources, storage resources, and/or computeresources), computer software, or some combination thereof. The CU mayhave the capability to add and/or remove TNL associations (which maycomprise SCTP associations) to accommodate newly instantiatedcomputational resources or shut down of computational resources of theCU. The CU configuration update procedure 300 may be initiated tofacilitate the addition or removal of the TNL associations.

The CU configuration update procedure 300 may include transmission of amessage 302 from a CU 304 of an access node to a DU 306 of the accessnode. The message 302 may be a CU configuration update message or agNB-CU configuration update message. The message 302 may be sent by theCU 304 to transfer updated information for a TNL association between theCU 304 and the DU 306. The message 302 may include information regardingTNL associations that may be added and/or TNL associations that may beremoved. The TNL associations may comprise SCTP associations in someembodiments. In some embodiments, the CU 304 may transmit the message302 in response to a newly instantiated computational resource of the CU304 or a shutdown of a computational resource of the CU 304.

In response to receiving the message 302, the DU 306 transmits aresponse message 308 to the CU 304. For example, the DU 306 may attemptto establish or remove one or more TNL associations in response toreceiving the message 302 from the CU 304. The response message 308 mayindicate a result of the attempt to establish or remove the TNLassociations. Further, the response message 308 may indicate whether theDU 306 can accept the update. If the DU 306 can accept the update, theresponse message 308 may be a CU configuration update acknowledgemessage or a gNB-CU configuration update acknowledge message, as shown.If the DU 306 cannot accept the update, the response message 308 may bea CU configuration update failure message or a gNB-CU configurationupdate failure message.

FIG. 4 illustrates example IEs that may be included in a message,according to various embodiments. In particular, one or more of the IEsmay be included in a message, such as the message 302 (FIG. 3). Themessage that includes the IEs may be a CU configuration update messageor a gNB-CU configuration update message.

The message may include a message type IE 402. The message type IE 402may identify the message. In particular, the message type IE 402 mayuniquely identify the message.

The message may further include IEs related to cells to be activated bya DU of an access node. For example, the message may include a cells tobe activated list IE 404, a cells to be activated list item IE 406, anNR cell identifier IE 408, a gNB-CU system information IE 410, abroadcast PLMN IE 412, a TAI IE 414, or some combination thereof. Thecells to be activated list IE 404 indicates whether there are cells tobe activated or modified. The cells to be activated list item IE 406indicates a list of cells to be activated. The NR cell identifier IE 408indicates NR cell identifiers for the cells to be activated. The gNB-CUsystem information IE 410 includes an RRC container with systeminformation owned by the gNB-CU. The broadcast PLMN IE 412 indicatesavailable PLMNs. The TAI IE 414 indicates supported single-network sliceselection assistance information.

The message may further include IEs related to cells to be deactivatedby the gNB-DU. For example, the message may include a cells to bedeactivated list IE 416, a cells to be deactivated list item IE 418, anNR cell identifier IE 420, or some combination thereof. The cells to bedeactivated list IE 416 indicates whether there are cells to bedeactivated. The cells to be deactivated list item IE 418 indicates alist of cells to be deactivated. The NR cell identifier IE 420 indicatesNR cell identifiers for the cells to be deactivated.

The message may further include IEs related to TNL associations to beadded. In some embodiments, the TNL associations may comprise SCTPassociations. The TNL associations to be added may be related to newlyinstantiated computational resources of the CU, where the TNLassociations may be established via one or more TNL addresses of CU thatmay be associated with the newly instantiated computational resources.In other instances, the TNL associations may be related to computationresources being reassigned among DUs that are communicatively coupled tothe CU.

The IEs related to TNL associations to be added may include a CU TNL tobe setup list IE 422 (which may also be referred to as a gNB-CU TNLassociation to add list IE), a CU TNL to be setup item IEs 424 (whichmay also be referred to as a gNB-CU TNL association to add item IEs), aCU transport layer address IE 426 (which may also be referred to as aTNL association transport layer information IE), or some combinationthereof. The IEs related to the TNL associations to be added may provideinformation for a DU to establish TNL associations between the CU andthe DU in addition to the TNL associations that have already beenestablished.

The CU TNL to be setup list IE 422 indicates whether TNL associationsbetween the CU and the DU are to be established by the DU. For example,the CU TNL to be setup list IE 422 may contain a first value thatindicates that there are TNL associations to be established or a secondvalue that indicates that there are not TNL associations to beestablished. The TNL associations to be established may be in additionto TNL associations previously established between the CU and the DU.

The CU TNL to be setup item IEs 424 indicates one or more TNLassociations between the CU and the DU that should be established by theDU. For example, the CU TNL to be setup item IEs 424 may include a listof TNL associations to be established.

The CU transport layer address IE 426 indicates one or more TNLaddresses of the CU. The DU may utilize the TNL addresses forestablishing one or more TNL associations between the CU and the DU. Forexample, the DU may establish, or attempt to establish, the TNLassociations indicated by the CU TNL to be setup item IEs 424 via theone or more TNL addresses indicated by the CU transport layer address IE426. In some embodiments, the TNL associations may be SCTP associations.

The message may further include IEs related to TNL associations to beremoved. In some embodiments, the TNL associations may comprise SCTPassociations. The TNL associations to be removed may be related tocomputational resources of the CU that were, or are being, shut down. Inother instances, the TNL associations to be removed may be related tocomputation resources being reassigned to other DUs that arecommunicatively coupled to the CU.

The IEs related to TNL associations to be removed may include a CU TNLto be removed list IE 428 (which may also be referred to as a gNB-CU TNLassociation to remove list IE), a CU TNL to be removed item IEs 430(which may also be referred to as a gNB-CU TNL association to removeitem IEs), a CU transport layer address IE 432 (which may also bereferred to as a TNL association transport layer address IE), or somecombination thereof. The IEs related to the TNL associations to beremoved may provide information for a DU to remove TNL associationsbetween the CU and the DU that had been previously established.

The CU TNL to be removed list IE 428 indicates whether TNL associationsbetween the CU and the DU are to be removed by the DU. For example, theCU TNL to be removed list IE 428 may contain a first value thatindicates that there are TNL associations to be removed or a secondvalue that indicates that there are not TNL associations to be removed.

The CU TNL to be removed item IEs 430 indicates one or more TNLassociations between the CU and the DU that should be removed by the DU.For example, the CU TNL to be removed item IEs 430 may include a list ofTNL associations to be removed.

The CU transport layer address IE 432 indicates one or more TNLaddresses of the CU from which the TNL associations are to be removed.The DU may utilize the TNL addresses for removing one or more TNLassociations between the CU and the DU. For example, the DU may remove,or attempt to remove, the TNL associations indicated by the CU TNL to beremoved item IEs 430 from the one or more TNL addresses indicated by theCU transport layer address IE 432. In some embodiments, the TNLassociations may be SCTP associations.

Further, in some embodiments, the message may include one or more IEsthat utilize resources to be utilized for load balancing. For example,the IEs may include an IE that indicates a TNL association that is to beutilized for load balancing. The CU may then utilize the indicated TNLassociation for transmission of a first message from the CU to the DU.

FIG. 5 illustrates an example portion of a network implementation 500that includes virtualized access nodes, according to variousembodiments. For example, the virtualized access nodes may comprisevirtualized gNBs, virtualized ng-eNB, or some combination thereof.

The network implementation 500 includes a core network (CN) 502. The CN502 may comprise the CN XS20 (FIG. 6) or the CN XR20 (FIG. 7).

The network implementation 500 includes one or more virtualized accessnodes. For example, the network implementation 500 includes a firstvirtualized access node 504 and a second virtualized access node 506.Each of the virtualized access nodes may provide service to one or moreuser equipments (UEs). For example, the network implementation 500includes a first UE 508 that is provided service by the firstvirtualized access node 504 and a second UE 510 that is provided serviceby the second virtualized access node 506.

Each of the virtualized access nodes include a CU and a DU. In someembodiments, multiple DUs may share a single CU. In the illustratedembodiment, the first virtualized access node 504 includes a first DU512 and a CU 514, and the second virtualized access node 506 includes asecond DU 516 and the CU 514. The CU of each virtualized access node maymanage the upper layers of the virtualized access node and the DU ofeach virtualized access node may manage the lower layers. For example,the CU 514 may manage the non access stratum (NAS) layer, the internetprotocol (IP) layer, the RRC layer, and the packet data convergencecontrol (PDCP) layer, while the first DU 512 may manage the radio linkcontrol (RLC) layer and the medium access control (MAC) layer in someembodiments. In other embodiments, the CU 514 may manage the NAS layer,the IP layer, and the RRC layer, while the first DU 512 may manage thePDCP layer, the RLC layer, and the MAC layer. Each of the CU and the DUmay include computer hardware to implement management of the respectivelayers managed by the CU and the DU.

An F1 interface connection may be established between the DU and the CUin each of the virtualized access nodes. In particular, a first F1interface 518 may be established between the first DU 512 and the CU514, and a second F1 interface 520 may be established between the secondDU 516 and the CU 514. Each of the F1 interfaces may support one or moreTNL associations associated with the respective DU, where the TNLassociations facilitate communication between the respective DU and theCU. For example, the first F1 interface 518 is associated with the firstDU 512 and facilitates communication between the first DU 512 and the CU514, and the second F1 interface 520 is associated with the second DU516 and facilitates communication between the second DU 516 and the CU514 in the illustrated embodiment.

The CU 514 may include one or more computational resources 522. Inparticular, the CU 514 includes a first computational resource 522 a, asecond computational resource 522 b, a third computational resource 522c, and a fourth computational resource 522 d. The computationalresources 522 may include computer hardware (such as network resources,storage resource, and/or compute resources), computer software, or somecombination thereof. Additional computational resources 522 may bedynamically added to the CU 514 and/or computational resources 522 maybe dynamically shut down (and/or removed) from the CU 514.

To facilitate the addition and/or removal of the computational resources522, the CU 514 may add and/or remove TNL associations (which maycomprise SCTP associations) based on the addition and/or shut down ofcomputational resources 522. For example, the F1 setup procedure 100(FIG. 1) may be triggered in response to a TNL association becomingoperational. As computational resources 522 are added and/or removed,the gNB-CU configuration update procedure 300 (FIG. 3) to add and/orremove TNL associations may be performed. The addition and/or removal ofthe computational resources 522 may further result in the additionand/or removal of corresponding TNL addresses of the CU 514.

FIG. 6 illustrates an architecture of a system XS00 of a network inaccordance with some embodiments. The system XS00 is shown to include auser equipment (UE) XS01 and a UE XS02. The UEs XS01 and XS02 areillustrated as smartphones (e.g., handheld touchscreen mobile computingdevices connectable to one or more cellular networks), but may alsocomprise any mobile or non-mobile computing device, such as PersonalData Assistants (PDAs), pagers, laptop computers, desktop computers,wireless handsets, or any computing device including a wirelesscommunications interface.

In some embodiments, any of the UEs XS01 and XS02 can comprise anInternet of Things (IoT) UE, which can comprise a network access layerdesigned for low-power IoT applications utilizing short-lived UEconnections. An IoT UE can utilize technologies such asmachine-to-machine (M2M) or machine-type communications (MTC) forexchanging data with an MTC server or device via a public land mobilenetwork (PLMN), Proximity-Based Service (ProSe) or device-to-device(D2D) communication, sensor networks, or IoT networks. The M2M or MTCexchange of data may be a machine-initiated exchange of data. An IoTnetwork describes interconnecting IoT UEs, which may include uniquelyidentifiable embedded computing devices (within the Internetinfrastructure), with short-lived connections. The IoT UEs may executebackground applications (e.g., keep-alive messages, status updates,etc.) to facilitate the connections of the IoT network.

The UEs XS01 and XS02 may be configured to connect, e.g.,communicatively couple, with a radio access network (RAN) XS10—the RANXS10 may be, for example, an Evolved Universal Mobile TelecommunicationsSystem (UMTS) Terrestrial Radio Access Network (E-UTRAN), a NextGen RAN(NG RAN), or some other type of RAN. The UEs XS01 and XS02 utilizeconnections XS03 and XS04, respectively, each of which comprises aphysical communications interface or layer (discussed in further detailbelow); in this example, the connections XS03 and XS04 are illustratedas an air interface to enable communicative coupling, and can beconsistent with cellular communications protocols, such as a GlobalSystem for Mobile Communications (GSM) protocol, a code-divisionmultiple access (CDMA) network protocol, a Push-to-Talk (PTT) protocol,a PTT over Cellular (POC) protocol, a Universal MobileTelecommunications System (UMTS) protocol, a 3GPP Long Term Evolution(LTE) protocol, a fifth generation (5G) protocol, a New Radio (NR)protocol, and the like.

In this embodiment, the UEs XS01 and XS02 may further directly exchangecommunication data via a ProSe interface XS05. The ProSe interface XS05may alternatively be referred to as a sidelink interface comprising oneor more logical channels, including but not limited to a PhysicalSidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel(PSSCH), a Physical Sidelink Discovery Channel (PSDCH), and a PhysicalSidelink Broadcast Channel (PSBCH).

The UE XS02 is shown to be configured to access an access point (AP)XS06 via connection XS07. The connection XS07 can comprise a localwireless connection, such as a connection consistent with any IEEE802.11 protocol, wherein the AP XS06 would comprise a wireless fidelity(WiFi®) router. In this example, the AP XS06 is shown to be connected tothe Internet without connecting to the core network of the wirelesssystem (described in further detail below).

The RAN XS10 can include one or more access nodes that enable theconnections XS03 and XS04. These access nodes (ANs) can be referred toas base stations (BSs), NodeBs, evolved NodeBs (eNBs), next GenerationNodeBs (gNB), next generation evolved NodeBs (ng-eNB), RAN nodes, and soforth, and can comprise ground stations (e.g., terrestrial accesspoints) or satellite stations providing coverage within a geographicarea (e.g., a cell). The RAN XS10 may include one or more RAN nodes forproviding macrocells, e.g., macro RAN node XS11, and one or more RANnodes for providing femtocells or picocells (e.g., cells having smallercoverage areas, smaller user capacity, or higher bandwidth compared tomacrocells), e.g., low power (LP) RAN node XS12.

Any of the RAN nodes XS11 and XS12 can terminate the air interfaceprotocol and can be the first point of contact for the UEs XS01 andXS02. In some embodiments, any of the RAN nodes XS11 and XS12 canfulfill various logical functions for the RAN XS10 including, but notlimited to, radio network controller (RNC) functions such as radiobearer management, uplink and downlink dynamic radio resource managementand data packet scheduling, and mobility management.

In accordance with some embodiments, the UEs XS01 and XS02 can beconfigured to communicate using Orthogonal Frequency-DivisionMultiplexing (OFDM) communication signals with each other or with any ofthe RAN nodes XS11 and XS12 over a multicarrier communication channel inaccordance various communication techniques, such as, but not limitedto, an Orthogonal Frequency-Division Multiple Access (OFDMA)communication technique (e.g., for downlink communications) or a SingleCarrier Frequency Division Multiple Access (SC-FDMA) communicationtechnique (e.g., for uplink and ProSe or sidelink communications),although the scope of the embodiments is not limited in this respect.The OFDM signals can comprise a plurality of orthogonal subcarriers.

In some embodiments, a downlink resource grid can be used for downlinktransmissions from any of the RAN nodes XS11 and XS12 to the UEs XS01and XS02, while uplink transmissions can utilize similar techniques. Thegrid can be a time-frequency grid, called a resource grid ortime-frequency resource grid, which is the physical resource in thedownlink in each slot. Such a time-frequency plane representation is acommon practice for OFDM systems, which makes it intuitive for radioresource allocation. Each column and each row of the resource gridcorresponds to one OFDM symbol and one OFDM subcarrier, respectively.The duration of the resource grid in the time domain corresponds to oneslot in a radio frame. The smallest time-frequency unit in a resourcegrid is denoted as a resource element. Each resource grid comprises anumber of resource blocks, which describe the mapping of certainphysical channels to resource elements. Each resource block comprises acollection of resource elements; in the frequency domain, this mayrepresent the smallest quantity of resources that currently can beallocated. There are several different physical downlink channels thatare conveyed using such resource blocks.

The physical downlink shared channel (PDSCH) may carry user data andhigher-layer signaling to the UEs XS01 and XS02. The physical downlinkcontrol channel (PDCCH) may carry information about the transport formatand resource allocations related to the PDSCH channel, among otherthings. It may also inform the UEs XS01 and XS02 about the transportformat, resource allocation, and H-ARQ (Hybrid Automatic Repeat Request)information related to the uplink shared channel. Typically, downlinkscheduling (assigning control and shared channel resource blocks to theUE XS01 and XS02 within a cell) may be performed at any of the RAN nodesXS11 and XS12 based on channel quality information fed back from any ofthe UEs XS01 and XS02. The downlink resource assignment information maybe sent on the PDCCH used for (e.g., assigned to) each of the UEs XS01and XS02.

The PDCCH may use control channel elements (CCEs) to convey the controlinformation. Before being mapped to resource elements, the PDCCHcomplex-valued symbols may first be organized into quadruplets, whichmay then be permuted using a sub-block interleaver for rate matching.Each PDCCH may be transmitted using one or more of these CCEs, whereeach CCE may correspond to nine sets of four physical resource elementsknown as resource element groups (REGs). Four Quadrature Phase ShiftKeying (QPSK) symbols may be mapped to each REG. The PDCCH can betransmitted using one or more CCEs, depending on the size of thedownlink control information (DCI) and the channel condition. There canbe four or more different PDCCH formats defined in LTE with differentnumbers of CCEs (e.g., aggregation level, L=1, 2, 4, or 8).

Some embodiments may use concepts for resource allocation for controlchannel information that are an extension of the above-describedconcepts. For example, some embodiments may utilize an enhanced physicaldownlink control channel (EPDCCH) that uses PDSCH resources for controlinformation transmission. The EPDCCH may be transmitted using one ormore enhanced the control channel elements (ECCEs). Similar to above,each ECCE may correspond to nine sets of four physical resource elementsknown as an enhanced resource element groups (EREGs). An ECCE may haveother numbers of EREGs in some situations.

The RAN XS10 is shown to be communicatively coupled to a core network(CN) XS20—via an S1 interface XS13. In embodiments, the CN XS20 may bean evolved packet core (EPC) network, a NextGen Packet Core (NPC)network, or some other type of CN. In this embodiment the S1 interfaceXS13 is split into two parts: the S1-U interface XS14, which carriestraffic data between the RAN nodes XS11 and XS12 and the serving gateway(S-GW) XS22, and the S1-mobility management entity (MME) interface XS15,which is a signaling interface between the RAN nodes XS11 and XS12 andMMEs XS21.

In this embodiment, the CN XS20 comprises the MMEs XS21, the S-GW XS22,the Packet Data Network (PDN) Gateway (P-GW) XS23, and a home subscriberserver (HSS) XS24. The MMEs XS21 may be similar in function to thecontrol plane of legacy Serving General Packet Radio Service (GPRS)Support Nodes (SGSN). The MMEs XS21 may manage mobility aspects inaccess such as gateway selection and tracking area list management. TheHSS XS24 may comprise a database for network users, includingsubscription-related information to support the network entities'handling of communication sessions. The CN XS20 may comprise one orseveral HSSs XS24, depending on the number of mobile subscribers, on thecapacity of the equipment, on the organization of the network, etc. Forexample, the HSS XS24 can provide support for routing/roaming,authentication, authorization, naming/addressing resolution, locationdependencies, etc.

The S-GW XS22 may terminate the S1 interface XS13 towards the RAN XS10,and routes data packets between the RAN XS10 and the CN XS20. Inaddition, the S-GW XS22 may be a local mobility anchor point forinter-RAN node handovers and also may provide an anchor for inter-3GPPmobility. Other responsibilities may include lawful intercept, charging,and some policy enforcement.

The P-GW XS23 may terminate an SGi interface toward a PDN. The P-GW XS23may route data packets between the EPC network XS23 and externalnetworks such as a network including the application server XS30(alternatively referred to as application function (AF)) via an InternetProtocol (IP) interface XS25. Generally, the application server XS30 maybe an element offering applications that use IP bearer resources withthe core network (e.g., UMTS Packet Services (PS) domain, LTE PS dataservices, etc.). In this embodiment, the P-GW XS23 is shown to becommunicatively coupled to an application server XS30 via an IPcommunications interface XS25. The application server XS30 can also beconfigured to support one or more communication services (e.g.,Voice-over-Internet Protocol (VoIP) sessions, PTT sessions, groupcommunication sessions, social networking services, etc.) for the UEsXS01 and XS02 via the CN XS20.

The P-GW XS23 may further be a node for policy enforcement and chargingdata collection. Policy and Charging Enforcement Function (PCRF) XS26 isthe policy and charging control element of the CN XS20. In a non-roamingscenario, there may be a single PCRF in the Home Public Land MobileNetwork (HPLMN) associated with a UE's Internet Protocol ConnectivityAccess Network (IP-CAN) session. In a roaming scenario with localbreakout of traffic, there may be two PCRFs associated with a UE'sIP-CAN session: a Home PCRF (H-PCRF) within a HPLMN and a Visited PCRF(V-PCRF) within a Visited Public Land Mobile Network (VPLMN). The PCRFXS26 may be communicatively coupled to the application server XS30 viathe P-GW XS23. The application server XS30 may signal the PCRF XS26 toindicate a new service flow and select the appropriate Quality ofService (QoS) and charging parameters. The PCRF XS26 may provision thisrule into a Policy and Charging Enforcement Function (PCEF) (not shown)with the appropriate traffic flow template (TFT) and QoS class ofidentifier (QCI), which commences the QoS and charging as specified bythe application server XS30.

FIG. 7 illustrates an architecture of a system XR00 of a network inaccordance with some embodiments. The system XR00 is shown to include aUE XR01, which may be the same or similar to UEs XS01 and XS02 discussedpreviously; a RAN node XR11, which may be the same or similar to RANnodes XS11 and XS12 discussed previously; a User Plane Function (UPF)XR02; a Data network (DN) XR03, which may be, for example, operatorservices, Internet access or 3rd party services; and a 5G Core Network(5GC or CN) XR20.

The CN XR20 may include an Authentication Server Function (AUSF) XR22; aCore Access and Mobility Management Function (AMF) XR21; a SessionManagement Function (SMF) XR24; a Network Exposure Function (NEF) XR23;a Policy Control function (PCF) XR26; a Network Function (NF) RepositoryFunction (NRF) XR25; a Unified Data Management (UDM) XR27; and anApplication Function (AF) XR28. The CN XR20 may also include otherelements that are not shown, such as a Structured Data Storage networkfunction (SDSF), an Unstructured Data Storage network function (UDSF),and the like.

The UPF XR02 may act as an anchor point for intra-RAT and inter-RATmobility, an external PDU session point of interconnect to DN XR03, anda branching point to support multi-homed PDU session. The UPF XR02 mayalso perform packet routing and forwarding, packet inspection, enforceuser plane part of policy rules, lawfully intercept packets (UPcollection); traffic usage reporting, perform QoS handling for userplane (e.g. packet filtering, gating, UL/DL rate enforcement), performUplink Traffic verification (e.g., SDF to QoS flow mapping), transportlevel packet marking in the uplink and downlink, and downlink packetbuffering and downlink data notification triggering. UPF XR02 mayinclude an uplink classifier to support routing traffic flows to a datanetwork. The DN XR03 may represent various network operator services,Internet access, or third party services. NY XR03 may include, or besimilar to application server XS30 discussed previously.

The AUSF XR22 may store data for authentication of UE XR01 and handleauthentication related functionality. The AUSF XR22 may facilitate acommon authentication framework for various access types.

The AMF XR21 may be responsible for registration management (e.g., forregistering UE XR01, etc.), connection management, reachabilitymanagement, mobility management, and lawful interception of AMF-relatedevents, and access authentication and authorization. AMF XR21 mayprovide transport for SM messages between and SMF XR24, and act as atransparent proxy for routing SM messages. AMF XR21 may also providetransport for short message service (SMS) messages between UE XR01 andan SMS function (SMSF) (not shown by FIG. 7). AMF XR21 may act asSecurity Anchor Function (SEA), which may include interaction with theAUSF XR22 and the UE XR01, receipt of an intermediate key that wasestablished as a result of the UE XR01 authentication process. WhereUSIM based authentication is used, the AMF XR21 may retrieve thesecurity material from the AUSF XR22. AMF XR21 may also include aSecurity Context Management (SCM) function, which receives a key fromthe SEA that it uses to derive access-network specific keys.Furthermore, AMF XR21 may be a termination point of RAN CP interface (N2reference point), a termination point of NAS (N1) signalling, andperform NAS ciphering and integrity protection.

AMF XR21 may also support NAS signalling with a UE XR01 over an N3interworking-function (IWF) interface. The N3IWF may be used to provideaccess to untrusted entities. N33IWF may be a termination point for theN2 and N3 interfaces for control plane and user plane, respectively, andas such, may handle N2 signalling from SMF and AMF for PDU sessions andQoS, encapsulate/de-encapsulate packets for IPSec and N3 tunnelling,mark N3 user-plane packets in the uplink, and enforce QoS correspondingto N3 packet marking taking into account QoS requirements associated tosuch marking received over N2. N3IWF may also relay uplink and downlinkcontrol-plane NAS (N1) signalling between the UE XR01 and AMF XR21, andrelay uplink and downlink user-plane packets between the UE XR01 and UPFXR02. The N3IWF also provides mechanisms for IPsec tunnel establishmentwith the UE XR01.

The SMF XR24 may be responsible for session management (e.g., sessionestablishment, modify and release, including tunnel maintain between UPFand AN node); UE IP address allocation & management (including optionalAuthorization); Selection and control of UP function; Configures trafficsteering at UPF to route traffic to proper destination; termination ofinterfaces towards Policy control functions; control part of policyenforcement and QoS; lawful intercept (for SM events and interface to LISystem); termination of SM parts of NAS messages; downlink DataNotification; initiator of AN specific SM information, sent via AMF overN2 to AN; determine SSC mode of a session. The SMF XR24 may include thefollowing roaming functionality: handle local enforcement to apply QoSSLAB (VPLMN); charging data collection and charging interface (VPLMN);lawful intercept (in VPLMN for SM events and interface to LI System);support for interaction with external DN for transport of signalling forPDU session authorization/authentication by external DN.

The NEF XR23 may provide means for securely exposing the services andcapabilities provided by 3GPP network functions for third party,internal exposure/re-exposure, Application Functions (e.g., AF XR28),edge computing or fog computing systems, etc. In such embodiments, theNEF XR23 may authenticate, authorize, and/or throttle the AFs. NEF XR23may also translate information exchanged with the AF XR28 andinformation exchanged with internal network functions. For example, theNEF XR23 may translate between an AF-Service-Identifier and an internal5GC information. NEF XR23 may also receive information from othernetwork functions (NFs) based on exposed capabilities of other networkfunctions. This information may be stored at the NEF XR23 as structureddata, or at a data storage NF using a standardized interfaces. Thestored information can then be re-exposed by the NEF XR23 to other NFsand AFs, and/or used for other purposes such as analytics.

The NRF XR25 may support service discovery functions, receive NFDiscovery Requests from NF instances, and provide the information of thediscovered NF instances to the NF instances. NRF XR25 also maintainsinformation of available NF instances and their supported services.

The PCF XR26 may provide policy rules to control plane function(s) toenforce them, and may also support unified policy framework to governnetwork behaviour. The PCF XR26 may also implement a front end (FE) toaccess subscription information relevant for policy decisions in a UDRof UDM XR27.

The UDM XR27 may handle subscription-related information to support thenetwork entities' handling of communication sessions, and may storesubscription data of UE XR01. The UDM XR27 may include two parts, anapplication FE and a User Data Repository (UDR). The UDM may include aUDM FE, which is in charge of processing of credentials, locationmanagement, subscription management and so on. Several different frontends may serve the same user in different transactions. The UDM-FEaccesses subscription information stored in the UDR and performsauthentication credential processing; user identification handling;access authorization; registration/mobility management; and subscriptionmanagement. The UDR may interact with PCF XR26. UDM XR27 may alsosupport SMS management, wherein an SMS-FE implements the similarapplication logic as discussed previously.

The AF XR28 may provide application influence on traffic routing, accessto the Network Capability Exposure (NCE), and interact with the policyframework for policy control. The NCE may be a mechanism that allows the5GC and AF XR28 to provide information to each other via NEF XR23, whichmay be used for edge computing implementations. In such implementations,the network operator and third party services may be hosted close to theUE XR01 access point of attachment to achieve an efficient servicedelivery through the reduced end-to-end latency and load on thetransport network. For edge computing implementations, the 5GC mayselect a UPF XR02 close to the UE XR01 and execute traffic steering fromthe UPF XR02 to DN XR03 via the N6 interface. This may be based on theUE subscription data, UE location, and information provided by the AFXR28. In this way, the AF XR28 may influence UPF (re)selection andtraffic routing. Based on operator deployment, when AF XR28 isconsidered to be a trusted entity, the network operator may permit AFXR28 to interact directly with relevant NFs.

As discussed previously, the CN XR20 may include an SMSF, which may beresponsible for SMS subscription checking and verification, and relayingSM messages to/from the UE XR01 to/from other entities, such as anSMS-GMSC/IWMSC/SMS-router. The SMS may also interact with AMF XR21 andUDM XR27 for notification procedure that the UE XR01 is available forSMS transfer (e.g., set a UE not reachable flag, and notifying UDM XR27when UE XR01 is available for SMS).

The system XR00 may include the following service-based interfaces:Namf: Service-based interface exhibited by AMF; Nsmf: Service-basedinterface exhibited by SMF; Nnef: Service-based interface exhibited byNEF; Npcf: Service-based interface exhibited by PCF; Nudm: Service-basedinterface exhibited by UDM; Naf: Service-based interface exhibited byAF; Nnrf: Service-based interface exhibited by NRF; and Nausf:Service-based interface exhibited by AUSF.

The system XR00 may include the following reference points: N1:Reference point between the UE and the AMF; N2: Reference point betweenthe (R)AN and the AMF; N3: Reference point between the (R)AN and theUPF; N4: Reference point between the SMF and the UPF; and N6: Referencepoint between the UPF and a Data Network. There may be many morereference points and/or service-based interfaces between the NF servicesin the NFs, however, these interfaces and reference points have beenomitted for clarity. For example, an N5 reference point may be betweenthe PCF and the AF; an N7 reference point may be between the PCF and theSMF; an N11 reference point between the AMF and SMF; etc. In someembodiments, the CN XR20 may include an Nx interface, which is aninter-CN interface between the MME (e.g., MME XS21) and the AMF XR21 inorder to enable interworking between CN XR20 and CN XS20.

Although not shown by FIG. 7, system XR00 may include multiple RAN nodesXR11 wherein an Xn interface is defined between two or more RAN nodesXR11 (e.g., gNBs and the like) that connecting to 5GC XR20, between aRAN node XR11 (e.g., gNB) connecting to 5GC XR20 and an eNB (e.g., a RANnode XS11 of FIG. 6), and/or between two eNBs connecting to 5GC XR20.

In some implementations, the Xn interface may include an Xn user plane(Xn-U) interface and an Xn control plane (Xn-C) interface. The Xn-U mayprovide non-guaranteed delivery of user plane PDUs and support/providedata forwarding and flow control functionality. The Xn-C may providemanagement and error handling functionality, functionality to manage theXn-C interface; mobility support for UE XR01 in a connected mode (e.g.,CM-CONNECTED) including functionality to manage the UE mobility forconnected mode between one or more RAN nodes XR11. The mobility supportmay include context transfer from an old (source) serving RAN node XR11to new (target) serving RAN node XR11; and control of user plane tunnelsbetween old (source) serving RAN node XR11 to new (target) serving RANnode XR11.

A protocol stack of the Xn-U may include a transport network layer builton Internet Protocol (IP) transport layer, and a GTP-U layer on top of aUDP and/or IP layer(s) to carry user plane PDUs. The Xn-C protocol stackmay include an application layer signaling protocol (referred to as XnApplication Protocol (Xn-AP)) and a transport network layer that isbuilt on an SCTP layer. The SCTP layer may be on top of an IP layer. TheSCTP layer provides the guaranteed delivery of application layermessages. In the transport IP layer point-to-point transmission is usedto deliver the signaling PDUs. In other implementations, the Xn-Uprotocol stack and/or the Xn-C protocol stack may be same or similar tothe user plane and/or control plane protocol stack(s) shown anddescribed herein.

FIG. 8 illustrates example components of a device XT00 in accordancewith some embodiments. In some embodiments, the device XT00 may includeapplication circuitry XT02, baseband circuitry XT04, Radio Frequency(RF) circuitry XT06, front-end module (FEM) circuitry XT08, one or moreantennas XT10, and power management circuitry (PMC) XT12 coupledtogether at least as shown. The components of the illustrated deviceXT00 may be included in a UE or a RAN node. In some embodiments, thedevice XT00 may include less elements (e.g., a RAN node may not utilizeapplication circuitry XT02, and instead include a processor/controllerto process IP data received from an EPC). In some embodiments, thedevice XT00 may include additional elements such as, for example,memory/storage, display, camera, sensor, or input/output (I/O)interface. In other embodiments, the components described below may beincluded in more than one device (e.g., said circuitries may beseparately included in more than one device for Cloud-RAN (C-RAN)implementations).

The application circuitry XT02 may include one or more applicationprocessors. For example, the application circuitry XT02 may includecircuitry such as, but not limited to, one or more single-core ormulti-core processors. The processor(s) may include any combination ofgeneral-purpose processors and dedicated processors (e.g., graphicsprocessors, application processors, etc.). The processors may be coupledwith or may include memory/storage and may be configured to executeinstructions stored in the memory/storage to enable various applicationsor operating systems to run on the device XT00. In some embodiments,processors of application circuitry XT02 may process IP data packetsreceived from an EPC.

The baseband circuitry XT04 may include circuitry such as, but notlimited to, one or more single-core or multi-core processors. Thebaseband circuitry XT04 may include one or more baseband processors orcontrol logic to process baseband signals received from a receive signalpath of the RF circuitry XT06 and to generate baseband signals for atransmit signal path of the RF circuitry XT06. Baseband processingcircuity XT04 may interface with the application circuitry XT02 forgeneration and processing of the baseband signals and for controllingoperations of the RF circuitry XT06. For example, in some embodiments,the baseband circuitry XT04 may include a third generation (3G) basebandprocessor XT04A, a fourth generation (4G) baseband processor XT04B, afifth generation (5G) baseband processor XT04C, or other basebandprocessor(s) XT04D for other existing generations, generations indevelopment or to be developed in the future (e.g., second generation(2G), sixth generation (6G), etc.). The baseband circuitry XT04 (e.g.,one or more of baseband processors XT04A-D) may handle various radiocontrol functions that enable communication with one or more radionetworks via the RF circuitry XT06. In other embodiments, some or all ofthe functionality of baseband processors XT04A-D may be included inmodules stored in the memory XT04G and executed via a Central ProcessingUnit (CPU) XT04E. The radio control functions may include, but are notlimited to, signal modulation/demodulation, encoding/decoding, radiofrequency shifting, etc. In some embodiments, modulation/demodulationcircuitry of the baseband circuitry XT04 may include Fast-FourierTransform (FFT), precoding, or constellation mapping/demappingfunctionality. In some embodiments, encoding/decoding circuitry of thebaseband circuitry XT04 may include convolution, tail-bitingconvolution, turbo, Viterbi, or Low Density Parity Check (LDPC)encoder/decoder functionality. Embodiments of modulation/demodulationand encoder/decoder functionality are not limited to these examples andmay include other suitable functionality in other embodiments.

In some embodiments, the baseband circuitry XT04 may include one or moreaudio digital signal processor(s) (DSP) XT04F. The audio DSP(s) XT04Fmay be include elements for compression/decompression and echocancellation and may include other suitable processing elements in otherembodiments. Components of the baseband circuitry may be suitablycombined in a single chip, a single chipset, or disposed on a samecircuit board in some embodiments. In some embodiments, some or all ofthe constituent components of the baseband circuitry XT04 and theapplication circuitry XT02 may be implemented together such as, forexample, on a system on a chip (SOC).

In some embodiments, the baseband circuitry XT04 may provide forcommunication compatible with one or more radio technologies. Forexample, in some embodiments, the baseband circuitry XT04 may supportcommunication with an evolved universal terrestrial radio access network(EUTRAN) or other wireless metropolitan area networks (WMAN), a wirelesslocal area network (WLAN), a wireless personal area network (WPAN).Embodiments in which the baseband circuitry XT04 is configured tosupport radio communications of more than one wireless protocol may bereferred to as multi-mode baseband circuitry.

RF circuitry XT06 may enable communication with wireless networks usingmodulated electromagnetic radiation through a non-solid medium. Invarious embodiments, the RF circuitry XT06 may include switches,filters, amplifiers, etc. to facilitate the communication with thewireless network. RF circuitry XT06 may include a receive signal pathwhich may include circuitry to down-convert RF signals received from theFEM circuitry XT08 and provide baseband signals to the basebandcircuitry XT04. RF circuitry XT06 may also include a transmit signalpath which may include circuitry to up-convert baseband signals providedby the baseband circuitry XT04 and provide RF output signals to the FEMcircuitry XT08 for transmission.

In some embodiments, the receive signal path of the RF circuitry XT06may include mixer circuitry XT06 a, amplifier circuitry XT06 b andfilter circuitry XT06 c. In some embodiments, the transmit signal pathof the RF circuitry XT06 may include filter circuitry XT06 c and mixercircuitry XT06 a. RF circuitry XT06 may also include synthesizercircuitry XT06 d for synthesizing a frequency for use by the mixercircuitry XT06 a of the receive signal path and the transmit signalpath. In some embodiments, the mixer circuitry XT06 a of the receivesignal path may be configured to down-convert RF signals received fromthe FEM circuitry XT08 based on the synthesized frequency provided bysynthesizer circuitry XT06 d. The amplifier circuitry XT06 b may beconfigured to amplify the down-converted signals and the filtercircuitry XT06 c may be a low-pass filter (LPF) or band-pass filter(BPF) configured to remove unwanted signals from the down-convertedsignals to generate output baseband signals. Output baseband signals maybe provided to the baseband circuitry XT04 for further processing. Insome embodiments, the output baseband signals may be zero-frequencybaseband signals, although this is not a requirement. In someembodiments, mixer circuitry XT06 a of the receive signal path maycomprise passive mixers, although the scope of the embodiments is notlimited in this respect.

In some embodiments, the mixer circuitry XT06 a of the transmit signalpath may be configured to up-convert input baseband signals based on thesynthesized frequency provided by the synthesizer circuitry XT06 d togenerate RF output signals for the FEM circuitry XT08. The basebandsignals may be provided by the baseband circuitry XT04 and may befiltered by filter circuitry XT06 c.

In some embodiments, the mixer circuitry XT06 a of the receive signalpath and the mixer circuitry XT06 a of the transmit signal path mayinclude two or more mixers and may be arranged for quadraturedownconversion and upconversion, respectively. In some embodiments, themixer circuitry XT06 a of the receive signal path and the mixercircuitry XT06 a of the transmit signal path may include two or moremixers and may be arranged for image rejection (e.g., Hartley imagerejection). In some embodiments, the mixer circuitry XT06 a of thereceive signal path and the mixer circuitry XT06 a may be arranged fordirect downconversion and direct upconversion, respectively. In someembodiments, the mixer circuitry XT06 a of the receive signal path andthe mixer circuitry XT06 a of the transmit signal path may be configuredfor super-heterodyne operation.

In some embodiments, the output baseband signals and the input basebandsignals may be analog baseband signals, although the scope of theembodiments is not limited in this respect. In some alternateembodiments, the output baseband signals and the input baseband signalsmay be digital baseband signals. In these alternate embodiments, the RFcircuitry XT06 may include analog-to-digital converter (ADC) anddigital-to-analog converter (DAC) circuitry and the baseband circuitryXT04 may include a digital baseband interface to communicate with the RFcircuitry XT06.

In some dual-mode embodiments, a separate radio IC circuitry may beprovided for processing signals for each spectrum, although the scope ofthe embodiments is not limited in this respect.

In some embodiments, the synthesizer circuitry XT06 d may be afractional-N synthesizer or a fractional N/N+1 synthesizer, although thescope of the embodiments is not limited in this respect as other typesof frequency synthesizers may be suitable. For example, synthesizercircuitry XT06 d may be a delta-sigma synthesizer, a frequencymultiplier, or a synthesizer comprising a phase-locked loop with afrequency divider.

The synthesizer circuitry XT06 d may be configured to synthesize anoutput frequency for use by the mixer circuitry XT06 a of the RFcircuitry XT06 based on a frequency input and a divider control input.In some embodiments, the synthesizer circuitry XT06 d may be afractional N/N+1 synthesizer.

In some embodiments, frequency input may be provided by a voltagecontrolled oscillator (VCO), although that is not a requirement. Dividercontrol input may be provided by either the baseband circuitry XT04 orthe applications processor XT02 depending on the desired outputfrequency. In some embodiments, a divider control input (e.g., N) may bedetermined from a look-up table based on a channel indicated by theapplications processor XT02.

Synthesizer circuitry XT06 d of the RF circuitry XT06 may include adivider, a delay-locked loop (DLL), a multiplexer and a phaseaccumulator. In some embodiments, the divider may be a dual modulusdivider (DMD) and the phase accumulator may be a digital phaseaccumulator (DPA). In some embodiments, the DMD may be configured todivide the input signal by either N or N+1 (e.g., based on a carry out)to provide a fractional division ratio. In some example embodiments, theDLL may include a set of cascaded, tunable, delay elements, a phasedetector, a charge pump and a D-type flip-flop. In these embodiments,the delay elements may be configured to break a VCO period up into Ndequal packets of phase, where Nd is the number of delay elements in thedelay line. In this way, the DLL provides negative feedback to helpensure that the total delay through the delay line is one VCO cycle.

In some embodiments, synthesizer circuitry XT06 d may be configured togenerate a carrier frequency as the output frequency, while in otherembodiments, the output frequency may be a multiple of the carrierfrequency (e.g., twice the carrier frequency, four times the carrierfrequency) and used in conjunction with quadrature generator and dividercircuitry to generate multiple signals at the carrier frequency withmultiple different phases with respect to each other. In someembodiments, the output frequency may be a LO frequency (fLO). In someembodiments, the RF circuitry XT06 may include an IQ/polar converter.

FEM circuitry XT08 may include a receive signal path which may includecircuitry configured to operate on RF signals received from one or moreantennas XT10, amplify the received signals and provide the amplifiedversions of the received signals to the RF circuitry XT06 for furtherprocessing. FEM circuitry XT08 may also include a transmit signal pathwhich may include circuitry configured to amplify signals fortransmission provided by the RF circuitry XT06 for transmission by oneor more of the one or more antennas XT10. In various embodiments, theamplification through the transmit or receive signal paths may be donesolely in the RF circuitry XT06, solely in the FEM XT08, or in both theRF circuitry XT06 and the FEM XT08.

In some embodiments, the FEM circuitry XT08 may include a TX/RX switchto switch between transmit mode and receive mode operation. The FEMcircuitry may include a receive signal path and a transmit signal path.The receive signal path of the FEM circuitry may include an LNA toamplify received RF signals and provide the amplified received RFsignals as an output (e.g., to the RF circuitry XT06). The transmitsignal path of the FEM circuitry XT08 may include a power amplifier (PA)to amplify input RF signals (e.g., provided by RF circuitry XT06), andone or more filters to generate RF signals for subsequent transmission(e.g., by one or more of the one or more antennas XT10).

In some embodiments, the PMC XT12 may manage power provided to thebaseband circuitry XT04. In particular, the PMC XT12 may controlpower-source selection, voltage scaling, battery charging, or DC-to-DCconversion. The PMC XT12 may often be included when the device XT00 iscapable of being powered by a battery, for example, when the device isincluded in a UE. The PMC XT12 may increase the power conversionefficiency while providing desirable implementation size and heatdissipation characteristics.

While FIG. 8 shows the PMC XT12 coupled only with the baseband circuitryXT04. However, in other embodiments, the PMC XT12 may be additionally oralternatively coupled with, and perform similar power managementoperations for, other components such as, but not limited to,application circuitry XT02, RF circuitry XT06, or FEM XT08.

In some embodiments, the PMC XT12 may control, or otherwise be part of,various power saving mechanisms of the device XT00. For example, if thedevice XT00 is in an RRC_Connected state, where it is still connected tothe RAN node as it expects to receive traffic shortly, then it may entera state known as Discontinuous Reception Mode (DRX) after a period ofinactivity. During this state, the device XT00 may power down for briefintervals of time and thus save power.

If there is no data traffic activity for an extended period of time,then the device XT00 may transition off to an RRC_Idle state, where itdisconnects from the network and does not perform operations such aschannel quality feedback, handover, etc. The device XT00 goes into avery low power state and it performs paging where again it periodicallywakes up to listen to the network and then powers down again. The deviceXT00 may not receive data in this state, in order to receive data, itmust transition back to RRC_Connected state.

An additional power saving mode may allow a device to be unavailable tothe network for periods longer than a paging interval (ranging fromseconds to a few hours). During this time, the device is totallyunreachable to the network and may power down completely. Any data sentduring this time incurs a large delay and it is assumed the delay isacceptable.

Processors of the application circuitry XT02 and processors of thebaseband circuitry XT04 may be used to execute elements of one or moreinstances of a protocol stack. For example, processors of the basebandcircuitry XT04, alone or in combination, may be used execute Layer 3,Layer 2, or Layer 1 functionality, while processors of the applicationcircuitry XT04 may utilize data (e.g., packet data) received from theselayers and further execute Layer 4 functionality (e.g., transmissioncommunication protocol (TCP) and user datagram protocol (UDP) layers).As referred to herein, Layer 3 may comprise a radio resource control(RRC) layer, described in further detail below. As referred to herein,Layer 2 may comprise a medium access control (MAC) layer, a radio linkcontrol (RLC) layer, and a packet data convergence protocol (PDCP)layer, described in further detail below. As referred to herein, Layer 1may comprise a physical (PHY) layer of a UE/RAN node, described infurther detail below.

FIG. 9 illustrates example interfaces of baseband circuitry inaccordance with some embodiments. As discussed above, the basebandcircuitry XT04 of FIG. 8 may comprise processors XT04A-XT04E and amemory XT04G utilized by said processors. Each of the processorsXT04A-XT04E may include a memory interface, XU04A-XU04E, respectively,to send/receive data to/from the memory XT04G.

The baseband circuitry XT04 may further include one or more interfacesto communicatively couple to other circuitries/devices, such as a memoryinterface XU12 (e.g., an interface to send/receive data to/from memoryexternal to the baseband circuitry XT04), an application circuitryinterface XU14 (e.g., an interface to send/receive data to/from theapplication circuitry XT02 of FIG. 8), an RF circuitry interface XU16(e.g., an interface to send/receive data to/from RF circuitry XT06 ofFIG. 8), a wireless hardware connectivity interface XU18 (e.g., aninterface to send/receive data to/from Near Field Communication (NFC)components, Bluetooth® components (e.g., Bluetooth® Low Energy), Wi-Fi®components, and other communication components), and a power managementinterface XU20 (e.g., an interface to send/receive power or controlsignals to/from the PMC XT12.

FIG. 10 is an illustration of a control plane protocol stack inaccordance with some embodiments. In this embodiment, a control planeXV00 is shown as a communications protocol stack between the UE XS01 (oralternatively, the UE XS02), the RAN node XS11 (or alternatively, theRAN node XS12), and the MME XS21.

The PHY layer XV01 may transmit or receive information used by the MAClayer XV02 over one or more air interfaces. The PHY layer XV01 mayfurther perform link adaptation or adaptive modulation and coding (AMC),power control, cell search (e.g., for initial synchronization andhandover purposes), and other measurements used by higher layers, suchas the RRC layer XV05. The PHY layer XV01 may still further performerror detection on the transport channels, forward error correction(FEC) coding/decoding of the transport channels, modulation/demodulationof physical channels, interleaving, rate matching, mapping onto physicalchannels, and Multiple Input Multiple Output (MIMO) antenna processing.

The MAC layer XV02 may perform mapping between logical channels andtransport channels, multiplexing of MAC service data units (SDUs) fromone or more logical channels onto transport blocks (TB) to be deliveredto PHY via transport channels, de-multiplexing MAC SDUs to one or morelogical channels from transport blocks (TB) delivered from the PHY viatransport channels, multiplexing MAC SDUs onto TBs, schedulinginformation reporting, error correction through hybrid automatic repeatrequest (HARD), and logical channel prioritization.

The RLC layer XV03 may operate in a plurality of modes of operation,including: Transparent Mode (TM), Unacknowledged Mode (UM), andAcknowledged Mode (AM). The RLC layer XV03 may execute transfer of upperlayer protocol data units (PDUs), error correction through automaticrepeat request (ARQ) for AM data transfers, and concatenation,segmentation and reassembly of RLC SDUs for UM and AM data transfers.The RLC layer XV03 may also execute re-segmentation of RLC data PDUs forAM data transfers, reorder RLC data PDUs for UM and AM data transfers,detect duplicate data for UM and AM data transfers, discard RLC SDUs forUM and AM data transfers, detect protocol errors for AM data transfers,and perform RLC re-establishment.

The PDCP layer XV04 may execute header compression and decompression ofIP data, maintain PDCP Sequence Numbers (SNs), perform in-sequencedelivery of upper layer PDUs at re-establishment of lower layers,eliminate duplicates of lower layer SDUs at re-establishment of lowerlayers for radio bearers mapped on RLC AM, cipher and decipher controlplane data, perform integrity protection and integrity verification ofcontrol plane data, control timer-based discard of data, and performsecurity operations (e.g., ciphering, deciphering, integrity protection,integrity verification, etc.).

The main services and functions of the RRC layer XV05 may includebroadcast of system information (e.g., included in Master InformationBlocks (MIBs) or System Information Blocks (SIBs) related to thenon-access stratum (NAS)), broadcast of system information related tothe access stratum (AS), paging, establishment, maintenance and releaseof an RRC connection between the UE and E-UTRAN (e.g., RRC connectionpaging, RRC connection establishment, RRC connection modification, andRRC connection release), establishment, configuration, maintenance andrelease of point to point Radio Bearers, security functions includingkey management, inter radio access technology (RAT) mobility, andmeasurement configuration for UE measurement reporting. Said MIBs andSIBs may comprise one or more information elements (IEs), which may eachcomprise individual data fields or data structures.

The UE XS01 and the RAN node XS11 may utilize a Uu interface (e.g., anLTE-Uu interface) to exchange control plane data via a protocol stackcomprising the PHY layer XV01, the MAC layer XV02, the RLC layer XV03,the PDCP layer XV04, and the RRC layer XV05.

The non-access stratum (NAS) protocols XV06 form the highest stratum ofthe control plane between the UE XS01 and the MME XS21. The NASprotocols XV06 support the mobility of the UE XS01 and the sessionmanagement procedures to establish and maintain IP connectivity betweenthe UE XS01 and the P-GW XS23.

The S1 Application Protocol (S1-AP) layer XV15 may support the functionsof the S1 interface and comprise Elementary Procedures (EPs). An EP is aunit of interaction between the RAN node XS11 and the CN XS20. The S1-APlayer services may comprise two groups: UE-associated services and nonUE-associated services. These services perform functions including, butnot limited to: E-UTRAN Radio Access Bearer (E-RAB) management, UEcapability indication, mobility, NAS signaling transport, RANInformation Management (RIM), and configuration transfer.

The Stream Control Transmission Protocol (SCTP) layer (alternativelyreferred to as the SCTP/IP layer) XV14 may ensure reliable delivery ofsignaling messages between the RAN node XS11 and the MME XS21 based, inpart, on the IP protocol, supported by the IP layer XV13. The L2 layerXV12 and the L1 layer XV11 may refer to communication links (e.g., wiredor wireless) used by the RAN node and the MME to exchange information.

The RAN node XS11 and the MME XS21 may utilize an S1-MME interface toexchange control plane data via a protocol stack comprising the L1 layerXV11, the L2 layer XV12, the IP layer XV13, the SCTP layer XV14, and theS1-AP layer XV15.

FIG. 11 is an illustration of a user plane protocol stack in accordancewith some embodiments. In this embodiment, a user plane XW00 is shown asa communications protocol stack between the UE XS01 (or alternatively,the UE XS02), the RAN node XS11 (or alternatively, the RAN node XS12),the S-GW XS22, and the P-GW XS23. The user plane XW00 may utilize atleast some of the same protocol layers as the control plane XV00. Forexample, the UE XS01 and the RAN node XS11 may utilize a Uu interface(e.g., an LTE-Uu interface) to exchange user plane data via a protocolstack comprising the PHY layer XV01, the MAC layer XV02, the RLC layerXV03, the PDCP layer XV04.

The General Packet Radio Service (GPRS) Tunneling Protocol for the userplane (GTP-U) layer XW04 may be used for carrying user data within theGPRS core network and between the radio access network and the corenetwork. The user data transported can be packets in any of IPv4, IPv6,or PPP formats, for example. The UDP and IP security (UDP/IP) layer XW03may provide checksums for data integrity, port numbers for addressingdifferent functions at the source and destination, and encryption andauthentication on the selected data flows. The RAN node XS11 and theS-GW XS22 may utilize an S1-U interface to exchange user plane data viaa protocol stack comprising the L1 layer XV11, the L2 layer XV12, theUDP/IP layer XW03, and the GTP-U layer XW04. The S-GW XS22 and the P-GWXS23 may utilize an S5/S8a interface to exchange user plane data via aprotocol stack comprising the L1 layer XV11, the L2 layer XV12, theUDP/IP layer XW03, and the GTP-U layer XW04. As discussed above withrespect to FIG. 10, NAS protocols support the mobility of the UE XS01and the session management procedures to establish and maintain IPconnectivity between the UE XS01 and the P-GW XS23.

FIG. 12 illustrates components of a core network in accordance with someembodiments. The components of the CN XS20 may be implemented in onephysical node or separate physical nodes including components to readand execute instructions from a machine-readable or computer-readablemedium (e.g., a non-transitory machine-readable storage medium). Inembodiments, the components of CN XR20 may be implemented in a same orsimilar manner as discussed herein with regard to the components of CNXS20. In some embodiments, Network Functions Virtualization (NFV) isutilized to virtualize any or all of the above described network nodefunctions via executable instructions stored in one or more computerreadable storage mediums (described in further detail below). A logicalinstantiation of the CN XS20 may be referred to as a network slice XX01.A logical instantiation of a portion of the CN XS20 may be referred toas a network sub-slice XX02 (e.g., the network sub-slice XX02 is shownto include the PGW XS23 and the PCRF XS26).

NFV architectures and infrastructures may be used to virtualize one ormore network functions, alternatively performed by proprietary hardware,onto physical resources comprising a combination of industry-standardserver hardware, storage hardware, or switches. In other words, NFVsystems can be used to execute virtual or reconfigurable implementationsof one or more EPC components/functions.

FIG. 13 is a block diagram illustrating components, according to someexample embodiments, of a system XY00 to support NFV. The system XY00 isillustrated as including a virtualized infrastructure manager (VIM)XY02, a network function virtualization infrastructure (NFVI) XY04, aVNF manager (VNFM) XY06, virtualized network functions (VNFs) XY08, anelement manager (EM) XY10, an NFV Orchestrator (NFVO) XY12, and anetwork manager (NM) XY14.

The VIM XY02 manages the resources of the NFVI XY04. The NFVI XY04 caninclude physical or virtual resources and applications (includinghypervisors) used to execute the system XY00. The VIM XY02 may managethe life cycle of virtual resources with the NFVI XY04 (e.g., creation,maintenance, and tear down of virtual machines (VMs) associated with oneor more physical resources), track VM instances, track performance,fault and security of VM instances and associated physical resources,and expose VM instances and associated physical resources to othermanagement systems.

The VNFM XY06 may manage the VNFs XY08. The VNFs XY08 may be used toexecute EPC components/functions. The VNFM XY06 may manage the lifecycle of the VNFs XY08 and track performance, fault and security of thevirtual aspects of VNFs XY08. The EM XY10 may track the performance,fault and security of the functional aspects of VNFs XY08. The trackingdata from the VNFM XY06 and the EM XY10 may comprise, for example,performance measurement (PM) data used by the VIM XY02 or the NFVI XY04.Both the VNFM XY06 and the EM XY10 can scale up/down the quantity ofVNFs of the system XY00.

The NFVO XY12 may coordinate, authorize, release and engage resources ofthe NFVI XY04 in order to provide the requested service (e.g., toexecute an EPC function, component, or slice). The NM XY14 may provide apackage of end-user functions with the responsibility for the managementof a network, which may include network elements with VNFs,non-virtualized network functions, or both (management of the VNFs mayoccur via the EM XY10).

FIG. 14 is a block diagram illustrating components, according to someexample embodiments, able to read instructions from a machine-readableor computer-readable medium (e.g., a non-transitory machine-readablestorage medium) and perform any one or more of the methodologiesdiscussed herein. Specifically, FIG. 14 shows a diagrammaticrepresentation of hardware resources XZ00 including one or moreprocessors (or processor cores) XZ10, one or more memory/storage devicesXZ20, and one or more communication resources XZ30, each of which may becommunicatively coupled via a bus XZ40. For embodiments where nodevirtualization (e.g., NFV) is utilized, a hypervisor XZ02 may beexecuted to provide an execution environment for one or more networkslices/sub-slices to utilize the hardware resources XZ00

The processors XZ10 (e.g., a central processing unit (CPU), a reducedinstruction set computing (RISC) processor, a complex instruction setcomputing (CISC) processor, a graphics processing unit (GPU), a digitalsignal processor (DSP) such as a baseband processor, an applicationspecific integrated circuit (ASIC), a radio-frequency integrated circuit(RFIC), another processor, or any suitable combination thereof) mayinclude, for example, a processor XZ12 and a processor XZ14.

The memory/storage devices XZ20 may include main memory, disk storage,or any suitable combination thereof. The memory/storage devices XZ20 mayinclude, but are not limited to any type of volatile or non-volatilememory such as dynamic random access memory (DRAM), static random-accessmemory (SRAM), erasable programmable read-only memory (EPROM),electrically erasable programmable read-only memory (EEPROM), Flashmemory, solid-state storage, etc.

The communication resources XZ30 may include interconnection or networkinterface components or other suitable devices to communicate with oneor more peripheral devices XZ04 or one or more databases XZ06 via anetwork XZ08. For example, the communication resources XZ30 may includewired communication components (e.g., for coupling via a UniversalSerial Bus (USB)), cellular communication components, NFC components,Bluetooth® components (e.g., Bluetooth® Low Energy), Wi-Fi® components,and other communication components.

Instructions XZ50 may comprise software, a program, an application, anapplet, an app, or other executable code for causing at least any of theprocessors XZ10 to perform any one or more of the methodologiesdiscussed herein. The instructions XZ50 may reside, completely orpartially, within at least one of the processors XZ10 (e.g., within theprocessor's cache memory), the memory/storage devices XZ20, or anysuitable combination thereof. Furthermore, any portion of theinstructions XZ50 may be transferred to the hardware resources XZ00 fromany combination of the peripheral devices XZ04 or the databases XZ06.Accordingly, the memory of processors XZ10, the memory/storage devicesXZ20, the peripheral devices XZ04, and the databases XZ06 are examplesof computer-readable and machine-readable media.

In some embodiments, the electronic device(s), network(s), system(s),chip(s) or component(s), or portions or implementations thereof, of anyother figure herein may be configured to perform one or more processes,techniques, or methods as described herein, or portions thereof.

Example 1 may include Distributed United (DU) of a gNB or ng-eNB,configured to receive from a Centralized Unit (CU) of a gNB or ng-eNB aplurality of TNL addresses. The said DU further configured to establisha plurality of SCTP associations using the said TNL addresses.

Example 2 may include the DU of example 1 or some other example herein,further configured to receive the said plurality of TNL addresses viathe F1 SETUP RESPONSE F1-AP message or the GNB-CU CONFIGURATION UPDATEF1-AP message.

Example 3 may include the DU of example 1 or some other example herein,further configured to distribute UE-associated messages between theplurality of the said established SCTP associations between the said DUand the said CU.

Example 4 may include the DU of example 1 or some other example herein,wherein further configured to receive an updated list of TNL addresses,including new addresses to be used of the newly instantiated CUinstances and addresses of shut down CU instances, which shall not beused anymore.

Example 5 may include an apparatus to be employed as a Distributed Unit(DU), the apparatus comprising: communication means for receiving an F1application protocol (F1-AP) message from a centralized unit (CU) overan F1 interface, wherein the F1-AP message is to include a plurality ofTransport Network Layer (TNL) addresses, and means for establishing aplurality of Stream Control Transmission Protocol (SCTP) associationsusing the plurality of TNL addresses.

Example 6 may include the apparatus of example 5 or some other exampleherein, wherein the F1-AP message is an F1 SETUP RESPONSE F1-AP messageor the GNB-CU CONFIGURATION UPDATE F1-AP message.

Example 7 may include the apparatus of examples 5-6 or some otherexample herein, further comprising load balancing means for implementingload balancing between the CU and DU.

Example 8 may include the apparatus of example 7 or some other exampleherein, wherein the load balancing means is for randomly selecting anSCTP association for every user equipment (UE) to be used by the DU andthe CU.

Example 9 may include the apparatus of example 7 or some other exampleherein, wherein the load balancing means is for using an SCTPassociation for every UE that is randomly selected by the CU.

Example 10 may include the apparatus of example 9 or some other exampleherein, wherein the communication means is for receiving an F1AP messagethat is to indicate the SCTP association that was randomly selected bythe CU.

Example 11 may include the apparatus of example 7 or some other exampleherein, wherein the load balancing means is for designating one SCTPassociation to be a load balancing SCTP association, and thecommunication means is for sending a first uplink (UL) message via theload balancing SCTP association; and for receiving a reply message viaanother SCTP association to be used for an individual UE by both the DUand the CU.

Example 12 may include the apparatus of example 7 or some other exampleherein, wherein the communication means is for receiving an indicationof weight factors for the SCTP associations from the CU, and the loadbalancing means are for applying the weight factors to the SCTPassociations in an SCTP association selection procedure such that SCTPassociation with a higher weight than other SCTP associations has higherlikelihood of being selected over the other SCTP associations.

Example 13 may include the apparatus of example 5 or some other exampleherein, wherein the communication means is for sending UE-associatedmessages between the plurality of established SCTP associations betweenthe DU and the CU.

Example 14 may include the apparatus of example 5 or some other exampleherein, wherein the communication means is for receiving another F1-APmessage, the other F1-AP message to include an updated list of TNLaddresses, wherein the updated list of TNL address comprise newaddresses to be used for newly instantiated CU instances and addressesof shut down CU instances that are not be used anymore.

Example 15 may include the apparatus of examples 5-14 or some otherexample herein, wherein the apparatus is implemented in or by a nextgeneration NodeB (gNB) or next generation evolved NodeB (ng-eNB).

Example 16 may include an apparatus comprising means to perform one ormore elements of a method described in or related to any of examples1-15, or any other method or process described herein.

Example 17 may include one or more non-transitory computer-readablemedia comprising instructions to cause an electronic device, uponexecution of the instructions by one or more processors of theelectronic device, to perform one or more elements of a method describedin or related to any of examples 1-15, or any other method or processdescribed herein.

Example 18 may include an apparatus comprising logic, modules, orcircuitry to perform one or more elements of a method described in orrelated to any of examples 1-15, or any other method or processdescribed herein.

Example 19 may include a method, technique, or process as described inor related to any of examples 1-15, or portions or parts thereof.

Example 20 may include an apparatus comprising: one or more processorsand one or more computer readable media comprising instructions that,when executed by the one or more processors, cause the one or moreprocessors to perform the method, techniques, or process as described inor related to any of examples 1-15, or portions thereof.

Example 21 may include a signal as described in or related to any ofexamples 1-15, or portions or parts thereof.

Example 22 may include a signal in a wireless network as shown anddescribed herein.

Example 23 may include a method of communicating in a wireless networkas shown and described herein.

Example 24 may include a system for providing wireless communication asshown and described herein.

Example 25 may include a device for providing wireless communication asshown and described herein.

Example 26 may include one or more non-transitory computer-readablemedia having instructions stored thereon, wherein the instructions, inresponse to execution by one or more processors cause a centralized unit(CU) of an access node to generate a CU configuration update message,the CU configuration update message to include an indication of atransport network layer (TNL) address of the CU for which a TNLassociation between the CU and a distributed unit (DU) of the accessnode is to be added or removed, and cause the CU configuration updatemessage to be transmitted to the DU.

Example 27 may include the one or more non-transitory computer-readablemedia of example 26, wherein the CU configuration update message is tofurther include a list of TNL associations to be added or removedbetween the CU and the DU.

Example 28 may include the one or more non-transitory computer-readablemedia of example 26, wherein the CU configuration update messageindicates to the DU that the TNL association is to be established withthe CU via the TNL address.

Example 29 may include the one or more non-transitory computer-readablemedia of example 26, wherein the CU configuration update messageindicates to the DU that the TNL association associated with the TNLaddress is to be removed.

Example 30 may include the one or more non-transitory computer-readablemedia of example 26, wherein the TNL association comprises a streamcontrol transmission protocol (SCTP) association.

Example 31 may include the one or more non-transitory computer-readablemedia of example 26, wherein the access node is a next generation NodeB(gNB), the CU is a CU of the gNB (gNB-CU), the DU is a DU of the gNB(gNB-DU), and the CU configuration update message is a gNB-CUconfiguration update message.

Example 32 may include the one or more non-transitory computer-readablemedia of example 26, wherein the CU configuration update message isgenerated in response to an instantiation of a computational resource ofthe CU.

Example 33 may include the one or more non-transitory computer-readablemedia of example 26, wherein the CU configuration update message furtherincludes an indication that the TNL association is to be used for loadbalancing.

Example 34 may include an apparatus for a centralized unit (CU) of anaccess node, comprising circuitry to generate a CU configuration updatemessage, the CU configuration update message including an indication ofa transport network layer (TNL) address to be utilized by a distributedunit (DU) of the access node to add a TNL association between the CU andthe DU, and memory coupled to the circuitry, the memory to store the CUconfiguration update message for transmission to the DU.

Example 35 may include the apparatus of example 34, wherein the CUconfiguration update message further includes a list of TNL associationsto be established between the CU and the DU.

Example 36 may include the apparatus of example 34, wherein the TNLassociation comprises a stream control transmission protocol (SCTP)association.

Example 37 may include the apparatus of example 34, wherein thecircuitry is further to detect instantiation of a computational resourceof the CU, and wherein the CU configuration update message is generatedin response to detection of the instantiation of the computationalresource.

Example 38 may include the apparatus of example 34, wherein the accessnode is a next generation NodeB (gNB), the CU is a CU of the gNB(gNB-CU), the DU is a DU of the gNB (gNB-DU), and the CU configurationupdate message is a gNB-CU configuration update message.

Example 39 may include the apparatus of example 34, wherein the CUconfiguration update message further includes an indication that the TNLassociation is to be used for load balancing.

Example 40 may include an apparatus for a centralized unit (CU) of anaccess node, comprising circuitry to generate a CU configuration updatemessage, the CU configuration update message including an indication ofa transport network layer (TNL) address for which distributed unit (DU)of the access node is to remove a TNL association between the CU and theDU, and memory coupled to the circuitry, the memory to store the CUconfiguration update message for transmission to the DU.

Example 41 may include the apparatus of example 40, wherein the CUconfiguration update message further includes a list of TNL associationsthat the DU is to remove.

Example 42 may include the apparatus of example 40, wherein the accessnode is a next generation NodeB (gNB), the CU is a CU of the gNB(gNB-CU), the DU is a DU of the gNB (gNB-DU), and the CU configurationupdate message is a gNB-CU configuration update message.

Example 43 may include the apparatus of example 40, wherein thecircuitry is further to detect shut down of a computational resource ofthe CU, and wherein the CU configuration update message is generated inresponse to detection of the shut down of the computational resource ofthe CU.

Example 44 may include the apparatus of example 40, wherein the CUconfiguration update message further includes an indication of anotherTNL association to be used for load balancing.

Example 45 may include the apparatus of example 40, wherein the TNLassociation comprises a stream control transmission protocol (SCTP)association.

Example 46 may include one or more non-transitory computer-readablemedia having instructions stored thereon, wherein the instructions, inresponse to execution by one or more processors, cause a distributedunit (DU) of an access node to detect reception, from a centralized unit(CU) of the access node, of a CU configuration update message, the CUconfiguration update message to include an indication of a transportnetwork layer (TNL) address of the CU for which a TNL associationbetween the CU and the DU is to be added or removed, and initiateestablishment of the TNL association between the CU and the DU via theTNL address or removal of the TNL association in response to detectionof the reception of the CU configuration update message.

Example 47 may include the one or more non-transitory computer-readablemedia of example 46, wherein the CU configuration update message furtherincludes a list of TNL addresses that are to be added or removed.

Example 48 may include the one or more non-transitory computer-readablemedia of example 46, wherein the access node is a next generation NodeB(gNB), the CU is a CU of the gNB (gNB-CU), the DU is a DU of the gNB(gNB-DU), and the CU configuration update message is a gNB-CUconfiguration update message.

Example 49 may include a method, comprising generating a centralizedunit (CU) configuration update message, the CU configuration updatemessage to include an indication of a transport network layer (TNL)address of a CU of a access node for which a TNL association between theCU and a distributed unit (DU) of the access node is to be added orremoved, and causing the CU configuration update message to betransmitted to the DU.

Example 50 may include the method of example 49, wherein the CUconfiguration update message is to further include a list of TNLassociations to be added or removed between the CU and the DU.

Example 51 may include the method of example 49, wherein the CUconfiguration update message indicates to the DU that the TNLassociation is to be established with the CU via the TNL address.

Example 52 may include the method of example 49, wherein the gNB-CUconfiguration update message indicates to the gNB-DU that the TNLassociation associated with the TNL address is to be removed.

Example 53 may include the method of example 49, wherein the TNLassociation comprises a stream control transmission protocol (SCTP)association.

Example 54 may include the method of example 49, wherein the access nodeis a next generation NodeB (gNB), the CU is a CU of the gNB (gNB-CU),the DU is a DU of the gNB (gNB-DU), and the CU configuration updatemessage is a gNB-CU configuration update message.

Example 55 may include the method of example 49, wherein the CUconfiguration update message is generated in response to aninstantiation of a computational resource of the CU.

Example 56 may include a method, comprising generating a centralizedunit (CU) configuration update message, the CU configuration updatemessage including an indication of a transport network layer (TNL)address for which a distributed unit (DU) of an access node is to removea TNL association between the CU and the DU, and storing the CUconfiguration update message for transmission to the DU.

Example 57 may include the method of example 56, wherein the CUconfiguration update message further includes a list of TNL associationsthat the DU is to remove.

Example 58 may include the method of example 56, wherein the access nodeis a next generation NodeB (gNB), the CU is a CU of the gNB (gNB-CU),the DU is a DU of the gNB (gNB-DU), and the CU configuration updatemessage is a gNB-CU configuration update message.

Example 59 may include the method of example 56, wherein the circuitryis further to detect shut down of a computational resource of the CU,and wherein the CU configuration update message is generated in responseto detection of the shut down of the computational resource of the CU.

Example 60 may include the method of example 56, wherein the CUconfiguration update message further includes an indication of anotherTNL association to be used for load balancing.

Example 61 may include an apparatus to perform the method of any of theexamples 49-60 or some other example.

Example 62 may include means plus function for performing the method ofany of the examples 49-60 or some other example.

Example 63 may include one or more computer-readable media havinginstructions stored thereon, wherein the instructions, in response toexecution by one or more processors, cause the one or more processors toperform the method of any of the examples 49-60 or some other example.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the disclosed embodiments ofthe disclosed device and associated methods without departing from thespirit or scope of the disclosure. Thus, it is intended that the presentdisclosure covers the modifications and variations of the embodimentsdisclosed above provided that the modifications and variations comewithin the scope of any claims and their equivalents.

What is claimed is:
 1. One or more non-transitory computer-readablemedia having instructions stored thereon, wherein the instructions, inresponse to execution by one or more processors, cause a centralizedunit (CU) of an access node to: after an F1 setup procedure and inresponse to a change in one or more computational resources of the CU,generate a CU configuration update message, wherein the CU configurationupdate message comprises: a first list of one or more transport networklayer (TNL) addresses of the CU for which one or more TNL associationsbetween the CU and a distributed unit (DU) is to be added, and a secondlist of one or more TNL addresses of the CU for which one or more TNLassociations between the CU and the DU is to be removed; cause the CUconfiguration update message to be transmitted to the DU; and receive,from the DU, a CU configuration update acknowledgment message indicatingwhether the one or more TNL associations was added or removed.
 2. Theone or more non-transitory computer-readable media of claim 1, whereinthe CU configuration update message further comprises a firstinformation element (IE) comprising the first list of one or more TNLaddresses and a second IE comprising the second list of one or more TNLaddresses.
 3. The one or more non-transitory computer-readable media ofclaim 1, wherein the CU configuration update message indicates to the DUthat the one or more TNL associations is to be established with the CUvia the first list of one or more TNL addresses.
 4. The one or morenon-transitory computer-readable media of claim 1, wherein the CUconfiguration update message indicates to the DU that the one or moreTNL associations associated with the second list of one or more TNLaddresses is to be removed.
 5. The one or more non-transitorycomputer-readable media of claim 1, wherein at least one of the one ormore TNL associations to be added or the one or more TNL associations tobe removed comprises a stream control transmission protocol (SCTP)association.
 6. The one or more non-transitory computer-readable mediaof claim 1, wherein the access node is a next generation NodeB (gNB),the CU is a CU of the gNB (gNB-CU), the DU is a DU of the gNB (gNB-DU),and the CU configuration update message is a gNB-CU configuration updatemessage.
 7. The one or more non-transitory computer-readable media ofclaim 1, wherein the change in the one or more computational resourcesof the CU comprises an instantiation of an additional computationalresource of the CU and the CU configuration update message is generatedin response to the instantiation of the additional computationalresource of the CU.
 8. An apparatus for a centralized unit (CU) of anaccess node, comprising: circuitry configured to generate, after an F1setup procedure and in response to a change in one or more computationalresources of the CU, a CU configuration update message, wherein the CUconfiguration update message comprises: a first list of one or moretransport network layer (TNL) addresses of the CU for which one or moreTNL associations between the CU and a distributed unit (DU) is to beadded, and a second list of one or more TNL addresses of the CU forwhich one or more TNL associations between the CU and the DU is to beremoved; and memory coupled to the circuitry, the memory configured tostore the CU configuration update message for transmission to the DU. 9.The one or more non-transitory computer-readable media of claim 1,wherein the change in the one or more computational resources of the CUcomprises a shutdown of a computational resource of the CU and the CUconfiguration update message is generated in response to the shutdown ofthe computational resource of the CU.
 10. The one or more non-transitorycomputer-readable media of claim 1, wherein the CU configuration updatemessage comprises an information element (IE) including a list of theone or more TNL associations between the CU and the DU that are to beestablished by the DU.
 11. The one or more non-transitorycomputer-readable media of claim 10, wherein the CU configuration updatemessage further comprises a second IE including a second list of the oneor more TNL associations between the CU and the DU that are to beremoved by the DU.
 12. The one or more non-transitory computer-readablemedia of claim 1, wherein the CU configuration update message comprises:a first information element (IE) including a first value that indicatesthat the one or more TNL associations between the CU and the DU is to beadded, and a second IE including a second value that indicates that theone or more TNL associations between the CU and the DU is to be removed.13. The apparatus of claim 8, wherein the change in the one or morecomputational resources of the CU comprises an instantiation of anadditional computational resource of the CU, wherein the circuitry isfurther configured to detect the instantiation of the additionalcomputational resource of the CU, and wherein the CU configurationupdate message is generated in response to the detection of theinstantiation of the additional computational resource.
 14. Theapparatus of claim 8, wherein the circuitry is further configured totransmit the CU configuration update message to the DU and configured toreceive, from the DU, a CU configuration update acknowledgment messageindicating whether the TNL associations was added or removed.
 15. Anapparatus for a centralized unit (CU) of an access node, comprising:circuitry configured to: generate, after an F1 setup procedure and inresponse to a change in one or more computational resources of the CU, aCU configuration update message, wherein the CU configuration updatemessage comprises a first list of one or more transport network layer(TNL) addresses of the CU for which one or more TNL associations betweenthe CU and a distributed unit (DU) is to be removed; and receive, fromthe DU, a CU configuration update acknowledgment message indicating thatthe TNL association was removed; and memory coupled to the circuitry,the memory configured to store the CU configuration update message fortransmission to the DU.
 16. The apparatus of claim 15, wherein the CUconfiguration update message further comprises an information elementcomprising the one or more TNL associations that the DU is to remove.17. The apparatus of claim 15, wherein the circuitry is furtherconfigured to transmit the CU configuration update message to the DU.18. The apparatus of claim 15, wherein the change in the one or morecomputational resources of the CU comprises a shutdown of acomputational resource of the CU, wherein the circuitry is furtherconfigured to detect the shutdown of the computational resource of theCU, and wherein the CU configuration update message is generated inresponse to the detection of the shutdown of the computational resourceof the CU.
 19. The apparatus of claim 15, wherein the CU configurationupdate message further comprises an indication of another TNLassociation to be used for load balancing.
 20. One or morenon-transitory computer-readable media having instructions storedthereon, wherein the instructions, in response to execution by one ormore processors, cause a distributed unit (DU) of an access node to:detect reception, from a centralized unit (CU) of the access node, of aCU configuration update message, the CU configuration update messagecomprising a first list of one or more transport network layer (TNL)addresses of the CU, the first list comprising a first TNL address ofthe CU for which a first TNL association between the CU and the DU is tobe added and a second TNL address of the CU for which a second TNLassociation between the CU and the DU is to be removed, wherein the CUconfiguration update message is received after an F1 setup procedure andin response to a change in one or more computational resources of theCU; initiate establishment of the first TNL association between the CUand the DU via the first TNL address in response to the detection of thereception of the CU configuration update message; and initiate removalof the second TNL association between the CU and the DU via the secondTNL address in response to the detection of the reception of the CUconfiguration update message.